On this day in 1943, 42,000 Jews were murdered in Aktion Erntefest (Operation Harvest Festival), which was the largest massacre of Jews within 24 hours. Occurring in Lublin, Poland, Operation Harvest Festival brought an end to Operation Reinhard, the two-year campaign to murder all Jews in the German General Government. Operation Reinhard was responsible for the murder of two million Jews between October 1941 and November 1943.By November 1943, Germany became concerned with the amount of Jewish resistance in both ghettos and extermination camps. This came after uprisings occurred at the Vilna and Bialystok ghettos and at the Treblinka and Sobibor death camps. Beginning on November 3, German forces in Lublin ordered the prisoners to dig anti-aircraft trenches. In the early morning, the Majdanek concentration camp, and its two subcamps, were surrounded by SS troops who brought prisoners from the camps to the trenches that would soon become their graves. At Majdanek, 18,400 Jews were murdered, while at Trawniki, between 6,000 and 10,000 Jews were murdered. At each camp, prisoners were ordered to strip naked and clasp their hands behind their necks before being marched to the trenches. To conceal the murders from neighboring camps, the Nazis played dance music over loudspeakers.Operation Harvest Festival rid the Lublin district of Jews by November 4, 1943, and became the largest German-perpetrated massacre in the Holocaust, taking 42,000 Jewish lives.